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<div class="title">fftprivate.h</div>  </div>
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<div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="preprocessor">#ifndef FFTPRIVATE_H</span>
<a name="l00002"></a>00002 <span class="preprocessor"></span><span class="preprocessor">#define FFTPRIVATE_H</span>
<a name="l00003"></a>00003 <span class="preprocessor"></span>
<a name="l00004"></a>00004 <span class="preprocessor">#include &lt;QObject&gt;</span>
<a name="l00005"></a>00005 <span class="preprocessor">#include &quot;DSP.h&quot;</span>
<a name="l00006"></a>00006 
<a name="l00007"></a>00007 <span class="comment">//class FFT;</span>
<a name="l00008"></a>00008 
<a name="l00009"></a>00009 <span class="comment">/*****************************************************************************</span>
<a name="l00010"></a>00010 <span class="comment">*                                                                            *</span>
<a name="l00011"></a>00011 <span class="comment">*       DIGITAL SIGNAL PROCESSING TOOLS                                      *</span>
<a name="l00012"></a>00012 <span class="comment">*       Version 1.03, 2001/06/15                                             *</span>
<a name="l00013"></a>00013 <span class="comment">*       (c) 1999 - Laurent de Soras                                          *</span>
<a name="l00014"></a>00014 <span class="comment">*                                                                            *</span>
<a name="l00015"></a>00015 <span class="comment">*       FFTPrivate.h                                                            *</span>
<a name="l00016"></a>00016 <span class="comment">*       Fourier transformation of real number arrays.                        *</span>
<a name="l00017"></a>00017 <span class="comment">*       Portable ISO C++                                                     *</span>
<a name="l00018"></a>00018 <span class="comment">*                                                                            *</span>
<a name="l00019"></a>00019 <span class="comment">* Tab = 3                                                                    *</span>
<a name="l00020"></a>00020 <span class="comment">*****************************************************************************/</span>
<a name="l00021"></a>00021 
<a name="l00022"></a>00022 <span class="preprocessor">#if defined (FFTPrivate_CURRENT_HEADER)</span>
<a name="l00023"></a>00023 <span class="preprocessor"></span><span class="preprocessor">    #error Recursive inclusion of FFTPrivate header file.</span>
<a name="l00024"></a>00024 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
<a name="l00025"></a>00025 <span class="preprocessor"></span><span class="preprocessor">#define FFTPrivate_CURRENT_HEADER</span>
<a name="l00026"></a>00026 <span class="preprocessor"></span>
<a name="l00027"></a>00027 <span class="preprocessor">#if ! defined (FFTPrivate_HEADER_INCLUDED)</span>
<a name="l00028"></a>00028 <span class="preprocessor"></span><span class="preprocessor">#define FFTPrivate_HEADER_INCLUDED</span>
<a name="l00029"></a>00029 <span class="preprocessor"></span>
<a name="l00030"></a>00030 <span class="preprocessor">#if defined (_MSC_VER)</span>
<a name="l00031"></a>00031 <span class="preprocessor"></span><span class="preprocessor">#pragma pack (push, 8)</span>
<a name="l00032"></a>00032 <span class="preprocessor"></span><span class="preprocessor">#endif  // _MSC_VER</span>
<a name="l00033"></a>00033 <span class="preprocessor"></span>
<a name="l00034"></a>00034 <span class="keyword">class </span>FFTPrivate : <span class="keyword">public</span> QObject
<a name="l00035"></a>00035 {
<a name="l00036"></a>00036     Q_OBJECT
<a name="l00037"></a>00037 
<a name="l00038"></a>00038 <span class="keyword">public</span>:
<a name="l00039"></a>00039 
<a name="l00040"></a>00040     <span class="comment">// Change this typedef to use a different floating point type in your FFTs</span>
<a name="l00041"></a>00041     <span class="comment">// (i.e. float, double or long double).</span>
<a name="l00042"></a>00042     <span class="keyword">typedef</span> <span class="keywordtype">float</span>       flt_t;
<a name="l00043"></a>00043     <span class="comment">//typedef TReal     flt_t;</span>
<a name="l00044"></a>00044 
<a name="l00045"></a>00045     <span class="keyword">explicit</span>                    FFTPrivate (<span class="keyword">const</span> <span class="keywordtype">long</span> length, <a class="code" href="class_d_s_p_1_1_f_f_t.html">DSP::FFT</a>* aPublicAPI = 0);
<a name="l00046"></a>00046                         ~FFTPrivate ();
<a name="l00047"></a>00047     <span class="keywordtype">void</span>                                do_fft (flt_t f [], <span class="keyword">const</span> flt_t x []) <span class="keyword">const</span>;
<a name="l00048"></a>00048     <span class="keywordtype">void</span>                                do_ifft (<span class="keyword">const</span> flt_t f [], flt_t x []) <span class="keyword">const</span>;
<a name="l00049"></a>00049     <span class="keywordtype">void</span>                                rescale (flt_t x []) <span class="keyword">const</span>;
<a name="l00050"></a>00050 
<a name="l00051"></a>00051 
<a name="l00052"></a>00052 
<a name="l00053"></a>00053 <span class="comment">/*\\\ PRIVATE \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*/</span>
<a name="l00054"></a>00054 
<a name="l00055"></a>00055 <span class="keyword">private</span>:
<a name="l00056"></a>00056 
<a name="l00057"></a>00057     <span class="comment">/* Bit-reversed look-up table nested class */</span>
<a name="l00058"></a>00058     <span class="keyword">class </span>BitReversedLUT
<a name="l00059"></a>00059     {
<a name="l00060"></a>00060     <span class="keyword">public</span>:
<a name="l00061"></a>00061         <span class="keyword">explicit</span>                        BitReversedLUT (<span class="keyword">const</span> <span class="keywordtype">int</span> nbr_bits);
<a name="l00062"></a>00062                             ~BitReversedLUT ();
<a name="l00063"></a>00063         <span class="keyword">const</span> <span class="keywordtype">long</span> *    get_ptr ()<span class="keyword"> const</span>
<a name="l00064"></a>00064 <span class="keyword">        </span>{
<a name="l00065"></a>00065             <span class="keywordflow">return</span> (_ptr);
<a name="l00066"></a>00066         }
<a name="l00067"></a>00067     <span class="keyword">private</span>:
<a name="l00068"></a>00068         <span class="keywordtype">long</span> *                  _ptr;
<a name="l00069"></a>00069     };
<a name="l00070"></a>00070 
<a name="l00071"></a>00071     <span class="comment">/* Trigonometric look-up table nested class */</span>
<a name="l00072"></a>00072     <span class="keyword">class       </span>TrigoLUT
<a name="l00073"></a>00073     {
<a name="l00074"></a>00074     <span class="keyword">public</span>:
<a name="l00075"></a>00075         <span class="keyword">explicit</span>                        TrigoLUT (<span class="keyword">const</span> <span class="keywordtype">int</span> nbr_bits);
<a name="l00076"></a>00076                             ~TrigoLUT ();
<a name="l00077"></a>00077         <span class="keyword">const</span> flt_t     *       get_ptr (<span class="keyword">const</span> <span class="keywordtype">int</span> level)<span class="keyword"> const</span>
<a name="l00078"></a>00078 <span class="keyword">        </span>{
<a name="l00079"></a>00079             <span class="keywordflow">return</span> (_ptr + (1L &lt;&lt; (level - 1)) - 4);
<a name="l00080"></a>00080         };
<a name="l00081"></a>00081     <span class="keyword">private</span>:
<a name="l00082"></a>00082         flt_t   *                       _ptr;
<a name="l00083"></a>00083     };
<a name="l00084"></a>00084 
<a name="l00085"></a>00085     <span class="keyword">const</span> BitReversedLUT        _bit_rev_lut;
<a name="l00086"></a>00086     <span class="keyword">const</span> TrigoLUT      _trigo_lut;
<a name="l00087"></a>00087     <span class="keyword">const</span> flt_t         _sqrt2_2;
<a name="l00088"></a>00088     <span class="keyword">const</span> <span class="keywordtype">long</span>          _length;
<a name="l00089"></a>00089     <span class="keyword">const</span> <span class="keywordtype">int</span>           _nbr_bits;
<a name="l00090"></a>00090     flt_t *                     _buffer_ptr;
<a name="l00091"></a>00091 
<a name="l00092"></a>00092 
<a name="l00093"></a>00093 
<a name="l00094"></a>00094 <span class="comment">/*\\\ FORBIDDEN MEMBER FUNCTIONS \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*/</span>
<a name="l00095"></a>00095 
<a name="l00096"></a>00096 <span class="keyword">private</span>:
<a name="l00097"></a>00097 
<a name="l00098"></a>00098                         FFTPrivate (<span class="keyword">const</span> FFTPrivate &amp;other);
<a name="l00099"></a>00099     <span class="keyword">const</span> FFTPrivate&amp;   operator = (<span class="keyword">const</span> FFTPrivate &amp;other);
<a name="l00100"></a>00100     <span class="keywordtype">int</span>                         operator == (<span class="keyword">const</span> FFTPrivate &amp;other);
<a name="l00101"></a>00101     <span class="keywordtype">int</span>                         operator != (<span class="keyword">const</span> FFTPrivate &amp;other);
<a name="l00102"></a>00102 
<a name="l00103"></a>00103 <span class="keyword">private</span>:
<a name="l00104"></a>00104     <a class="code" href="class_d_s_p_1_1_f_f_t.html">DSP::FFT</a>* d;
<a name="l00105"></a>00105     <span class="keyword">friend</span> <span class="keyword">class </span><a class="code" href="class_d_s_p_1_1_f_f_t.html">DSP::FFT</a>;
<a name="l00106"></a>00106 
<a name="l00107"></a>00107 };
<a name="l00108"></a>00108 
<a name="l00109"></a>00109 
<a name="l00110"></a>00110 
<a name="l00111"></a>00111 <span class="preprocessor">#if defined (_MSC_VER)</span>
<a name="l00112"></a>00112 <span class="preprocessor"></span><span class="preprocessor">#pragma pack (pop)</span>
<a name="l00113"></a>00113 <span class="preprocessor"></span><span class="preprocessor">#endif  // _MSC_VER</span>
<a name="l00114"></a>00114 <span class="preprocessor"></span>
<a name="l00115"></a>00115 
<a name="l00116"></a>00116 
<a name="l00117"></a>00117 <span class="preprocessor">#endif  // FFTPrivate_HEADER_INCLUDED</span>
<a name="l00118"></a>00118 <span class="preprocessor"></span>
<a name="l00119"></a>00119 <span class="preprocessor">#undef FFTPrivate_CURRENT_HEADER</span>
<a name="l00120"></a>00120 <span class="preprocessor"></span>
<a name="l00121"></a>00121 
<a name="l00122"></a>00122 
<a name="l00123"></a>00123 <span class="comment">/*****************************************************************************</span>
<a name="l00124"></a>00124 <span class="comment"></span>
<a name="l00125"></a>00125 <span class="comment">    LEGAL</span>
<a name="l00126"></a>00126 <span class="comment"></span>
<a name="l00127"></a>00127 <span class="comment">    Source code may be freely used for any purpose, including commercial</span>
<a name="l00128"></a>00128 <span class="comment">    applications. Programs must display in their &quot;About&quot; dialog-box (or</span>
<a name="l00129"></a>00129 <span class="comment">    documentation) a text telling they use these routines by Laurent de Soras.</span>
<a name="l00130"></a>00130 <span class="comment">    Modified source code can be distributed, but modifications must be clearly</span>
<a name="l00131"></a>00131 <span class="comment">    indicated.</span>
<a name="l00132"></a>00132 <span class="comment"></span>
<a name="l00133"></a>00133 <span class="comment">    CONTACT</span>
<a name="l00134"></a>00134 <span class="comment"></span>
<a name="l00135"></a>00135 <span class="comment">    Laurent de Soras</span>
<a name="l00136"></a>00136 <span class="comment">    92 avenue Albert 1er</span>
<a name="l00137"></a>00137 <span class="comment">    92500 Rueil-Malmaison</span>
<a name="l00138"></a>00138 <span class="comment">    France</span>
<a name="l00139"></a>00139 <span class="comment"></span>
<a name="l00140"></a>00140 <span class="comment">    ldesoras@club-internet.fr</span>
<a name="l00141"></a>00141 <span class="comment"></span>
<a name="l00142"></a>00142 <span class="comment">*****************************************************************************/</span>
<a name="l00143"></a>00143 
<a name="l00144"></a>00144 
<a name="l00145"></a>00145 
<a name="l00146"></a>00146 <span class="comment">/*\\\ EOF \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*/</span>
<a name="l00147"></a>00147 
<a name="l00148"></a>00148 
<a name="l00149"></a>00149 <span class="preprocessor">#endif // FFTPRIVATE_H</span>
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